Collapsible core.



T. MIDGLEY, Sn. & T. MFDGLEY, in. COLLAPSIBLE CORE.

APPLICATION man JAN- 24. ms.

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I'HQMAS 1VIIDGLEY, SR., AND THOMAS MIDGL EY, 3B,, OF LANCASTER, OHIO.

COLLAPSIBLE CORE.

Specification of Letters Patent.

Patented June 2411, T916.

Application filed January 24, 1916. Serial No. 73,772.

To all whom it'mag concern:

Be it known that we, THOMAS MIDGLEY, Sin, and THoMAs MIncLnY, J12, citizens of the United States, residing at Lancaster, 1n the county of'Fairfield and State of Ohio, have invented certain new and useful Improvements in Collapsible Cores, of which sides inthe peculiar construction of joint. between the various sections forming the core annulus, whereby-the circumferential strain'is relieved to a marked extent and also wherein the lateral or sidewise play of the various sections is eliminated.

. A further object of our invention resides in the means'for holding the core sectlons tilt dfl

till

in assembled relation.

The preferred embodiment of our 1nvention is shown in theaccompanying sheet. of

drawings, in which similar characters of reference designate corresponding parts, and in which:

Figure 1 is a side View partially 'in section of. a segment of core, Fig. 2 is a top plan view of the segment shown in Fig.1, and, Fig. 3 is a sectiontaken on line 33 of Fig. 1.

It is to be understood that the present core is'composed of a plurality of sections 1 and 2 sufficient in number to form an'annulus, over which the tire may be formed. The abutting ends of the present sections 1. and 2, as shown, are of general Zshape', the leg portion being designated generally by the reference numerals 3 and 4 and the portion between the legs, or, as we have termed it, the intermediate portion, is designated generally by the reference numeral 55 These abutting ends are preferably faced with face plates such as shown at 6, and this facing may be made in any manner desired. In the present embodiment, we have shown four plates 6 arranged in two sets of two each, the outside plates of each set being stamped out as is shown at 7 and the two plates forming each set being riveted together, so that the facing plates may be attached to the various core segments during the process of casting, by placing: these plates when in their assembled relation, in

the mold imprint. This method of con,

ends of abutting sections to prevent sidewise or lateral play of these sections. Further, the intermediate portion of these plates is also preferably shaped to present an offset portion 9, the olfset in the present case being in a direction toward the outer periphery of the annulus as a whole. This latter construction is provided to relieve the circumferential strain when pressure'is applied to the sides of the formed tire casin before and during the time it is cured.

Where this pressure is applied directly to the sides of-the tire and consequently to the sides of the core, the natural tendency is for this annulus to increase its diameter and to do this there must be a separation between joints or between the abutting" ends of the various core sections. If this slight expansion is permitted, there is, of course, a groove formed on the interior of the tire casing, which is undesirable, and to avoid this and to also avoid shearing of the bolt structure to be presently described, we have provided the offset portion 9. It will be noted that this offset or hook shaped portion interlocks the core sections .in a circumferential direction and consequently the circumferential strain between the sections is overcome.

In order to hold the various c'ore sections in their assembled relation, we have provided a boltstructure designed topass through the intermediate portions 5 of the abutting core segments, this bolt structure comprising a bushing 10 having anenlarged head 11 and extending into thecore section 2. The interior of this bushing is threaded to receive the screw 12 which screw passes radially through the end of the core section 1. "When'the cores have been originally formed, the various sections are assembled and a hole the size of the screw 12, is drilled through both abuttingends. The end of the section 2 is then counterbored to receive the shank portion of the, bushing 10 and this'is then counterbored to receive the head portion 11 of the bushing. This bushing is made to have a driving fit with the core section 2 and in this manner the two ends must properly aline. itself providedin case the threads operating in connection with the screw 12 should be stripped. If these threads were made directly into the core body, it would, of course, be necessary to discard the entire core, but where these threads are stripped from the bushing 10, it is onlynecessary to remove this bushing and to replace it with another one:

From the foregoing description, it will be:

apparent that we have provided a type of core which may be made'at a considerably reduced cost. This is especially true when the facing plates 6 are attached to the core segments, after the manner illustrated in the patent referred to above, in which case the expense of properly shaping tlrese plates is .the same for all cases, with possibly the exception of the initial cost .of the dies. It will be seen that we have so shaped the abutting ends of these sections that they interlock to prevent lateral or sidewise play between sections and also interlock or en gage each other to relieve the circumferential strain caused .by the pressure applied to the sides of the core and tire casing during its manufacture; In addition, the manner'of holding together is very simple and also very efiicient, it beingpossible to knock down an entirecore by the removal of the screws 12 only.

iVhat we claim is:

1. A collapsible core comprising a plurality of core sections to form an annulus and means for holding said sections ,.-together, the abutting ends of said sections being shaped to interlock to prevent sidewise play and also shaped to present an offset portion to relieve circumferential strain.

- 2. A collapsible core comprising a plurality of core sections to form an annulus,

- a bolt structure passing through the ends of denies of this patent may The bushing 10 is.

mediate portion of these various core segments be obtained for five cents each, by addressing the Washington, D. 0."

abutting sections to hold them together, the

abutting ends of said sections beingshaped to interlock to prevent sidewise play and also shaped to present an offset portion to relieve circumferential strain.

3. A collapsible core comprising a plurality of core sections to form an annulus, the abutting ends of said members being of general Z-shape, and a bolt structure passing through the intermediate portion of said Z-shaped ends.

4. A collapsible core comprising a plurality of core sections to form an annulus, the abutting ends of said members being of general Z-shape, one pair of registering legs at each joint being shaped to interlock to prevent sidewise movement and the intermediate portion of each joint being shaped to present an offset to relieve circumferential strain, and means for holding said sections in their assembled relation.

5. A collapsible core comprising a plurality of core sections to form an annulus, the abutting ends of said members being of general Z-shape, one pair of registering legs at each joint being shaped to interlock to prevent sidewise movement and the intereach joint being shaped to present an offset to relieve circumferential straln, and a bolt structure passing through the intermediate portions of said Z-shaped ends.

6. A core comprising a plurality of core sections to form an annulus, the abutting ends of said sections being shaped to permit the removal of a core section inwardly, a threaded bushing located in the end of one section, and a screw passing through the end of the abutting section and adapted to be threaded into said bushing".

In testimony whereof we afiix our signatures in, presence of two witnesses.

THOMAS MIDGLEY, Sn. THOMAS MIDGLEY, JR.

WVitnesses:

J. \V. DEFFENBAUGI-I, ROSE MoUL'rEn.

"Commissioner of Patents. 

